Added "java-clean" target.
Changed to log a received command.
Fixed Slave.writeResultGeneric() to send payload size.
Enhanced logging of the slave to write the header.
Made the mock of close(2) in the Java slave.
Changed logging of the Java slave hub to write the header.
Fixed get_command_name() to exclude offset.
Fixed the Java slave to read payload size.
Changed the procedure for exit(2) to be implemented manually.

exit(2) does not follow the normal protocol.